Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Che, Bang-Jun; Meng, Fanman; Lyu, Yue-Long; Zhao, Yuanqing; Wu, Qun

doi:10.1088/1361-6463/ab8515

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…Furthermore, holographic MIMO enables highly efficient near-field power transfer [59]. Currently, holographic MIMO can be implemented by either a tightly coupled array of discrete active antennas [62], or low-profile metamaterial/metasurface elements that do not require bulky electronic components [64]- [66] and are excited by an RF source. The exploitation of the full potentials of holographic MIMO requires accurate understanding of its physical properties such as channel characteristics and beamforming methodologies.…”

Section: Future Evolutionmentioning

confidence: 99%

Women in Networks: Dr. Carla Fabiana Chiasserini, Politecnico di Torino, Italy

Chen¹

2021

IEEE Network

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She currently serves as the Vice Rector for Alumni and Career Orientation at Politecnico di Torino. She is an IEEE Fellow. Her research interests include the design of wireless network architectures, the defi nition of protocols and algorithms for mobile networks and applications, and the creation of theoretical models for the study and the performance evaluation of wireless systems. Her research is indeed a combination of system design and network-theory, aiming to design algorithms and methods that solve real problems, starting with actual data and scenarios. As far as application domains are concerned, she has been focusing on energy efficiency of wireless systems, connected cars, mobility services, service virtualization, and smart healthcare.After studying Latin and ancient Greek in high school, she decided for a change and enrolled in the Electrical Engineering B.S. and M.Sc. Program at the University of Florence, Italy. She did her Master thesis on security in wireless networks under the supervision of Prof. Aura Ganz, at the University of Massachusetts at Amherst, MA, and received her Ph.D. from Politecnico di Torino in 2000. During her Ph.D., she was a visiting scholar at the University of California at San Diego (UCSD), CA, working with Prof. Ramesh Rao. She was then a visiting researcher at UCSD in 2000-2003. These experiences gave her the unique opportunity to explore highly innovative aspects in energy efficiency of wireless communication devices as well as in local and personal wireless networks. In particular, she developed pioneering, highly inter-disciplinary work on the modeling of battery behavior in mobile devices and the designing of algorithms and protocols aiming at establishing the optimal tradeoff between energy saving and the level of user's quality of service. At UCSD she had the opportunity to also work with Prof. John Proakis and to participate in research projects involving large companies. Afterwards, she started investigating the coexistence between diff erent wireless technologies, and cooperation in distributed wireless networks through the lens of game theory. The work that Dr. Chiasserini developed on battery efficiency [1], technologies coexistence [2], and node cooperation

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Section: Future Evolutionmentioning

confidence: 99%

Women in Networks: Dr. Carla Fabiana Chiasserini, Politecnico di Torino, Italy

Chen¹

2021

IEEE Network

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“…Over the past decade, liquid crystal (LC) has been introduced into the microwave and millimeter wave domain from optical and has experienced mushroom growth [1][2][3]. As a fire-new type of tunable anisotropic material, it attracts extensive attention over the superiority of its small size, light weight, low cost, wide application frequency range and easy conformity [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Electronic Beam Steering Metamaterial Antenna with Dual-Tuned Mode of Liquid Crystal Material

et al. 2023

Sensors

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In this study, a dual-tuned mode of liquid crystal (LC) material was proposed and adopted on reconfigurable metamaterial antennas to expand the fixed-frequency beam-steering range. The novel dual-tuned mode of the LC is composed of double LC layers combined with composite right/left-handed (CRLH) transmission line theory. Through a multi-separated metal layer, the double LC layers can be loaded with controllable bias voltage independently. Therefore, the LC material exhibits four extreme states, among which the permittivity of LC can be varied linearly. On the strength of the dual-tuned mode of LC, a CRLH unit cell is elaborately designed on three-layer substrates with balanced dispersion values under arbitrary LC state. Then five CRLH unit cells are cascaded to form an electronically controlled beam-steering CRLH metamaterial antenna on a downlink Ku satellite communication band with dual-tuned characteristics. The simulated results demonstrate that the metamaterial antenna features’ continuous electronic beam-steering capacity from broadside to −35° at 14.4 GHz. Furthermore, the beam-steering properties are implemented in a broad frequency band from 13.8 GHz to 17 GHz, with good impedance matching. The proposed dual-tuned mode can make the regulation of LC material more flexible and enlarge the beam-steering range simultaneously.

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“…Compared with the electrically tunable material barium strontium titanate (BST) [1][2][3], the * Author to whom any correspondence should be addressed. nematic liquid crystal (LC) exhibits the advantages of low loss and low cost in frequency bands above 10 GHz, which are favorited by tunable phase shifters and electronically steerable antennas [4][5][6]. Most of the LC phase shifters are constructed by conventional transmission lines, such as inverted microstrip line (IMSL) [7][8][9][10][11], coplanar waveguide (CPW) [12,13], and waveguide [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Electrically tunable liquid crystal phase shifter with excellent phase shift capability per wavelength based on opposed coplanar waveguide

Wang¹,

Su²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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A tunable liquid crystal (LC) phase shifter based on opposed coplanar waveguide (OCPW) with excellent phase shift capability per wavelength is proposed. The proposed OCPW not only has good transmission characteristics and a quasi-TEM operating mode similar to the CPW, but also avoids the metalized via and complicated bias circuit in designing the phase shifter. Consequently, the phase shifter is easy to fabricate and miniaturize. The main structure of the phase shifter includes two functional components. One is the transition section, in which the flaring grounds and gradient stubs are utilized to realize the impedance and wave-number matching to the OCPW phase shift part; the other is a tunable phase shift section, which is composed of the OCPW centerline and ground with staggered periodic stubs stretching out. To realize tunable phase shifting by applying different DC bias voltages, a DC bias network capable of blocking RF signal is elaborately designed. An equivalent circuit model of the phase shift part is established and represented using the ABCD matrix, so that the relation between the related parameters and the phase shift per wavelength can be easily obtained to guide the design. The measurement results demonstrate that the proposed phase shifter achieves a total of 300° phase shifting, as high as 289°/λ0 phase shift per wavelength, and a good figure-of-merit (FoM) of 59°/dB at 14.5 GHz. The phase shifter features the reflection coefficient less than -10 dB and the transmission coefficient bigger than -6 dB from 9.3 GHz to 15 GHz.

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Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Cited by 16 publications

References 31 publications

Women in Networks: Dr. Carla Fabiana Chiasserini, Politecnico di Torino, Italy

Women in Networks: Dr. Carla Fabiana Chiasserini, Politecnico di Torino, Italy

Electronic Beam Steering Metamaterial Antenna with Dual-Tuned Mode of Liquid Crystal Material

Electrically tunable liquid crystal phase shifter with excellent phase shift capability per wavelength based on opposed coplanar waveguide

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